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<html lang="zh-CN">
<head>
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    <title>教务管理系统</title>
</head>
<body>

<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container-fluid">
        <div class="col-sm-10 col-sm-offset-1 col-md-10 col-md-offset-1">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar"
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                <a class="navbar-brand" href="#">教务管理系统</a>
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            <div id="navbar" class="navbar-collapse collapse">
                <ul class="nav navbar-nav navbar-left">
                    <li><a href="index.html">教师管理</a></li>
                    <li class="active"><a href="#">学生管理</a></li>
                    <li><a href="lessons.html">选课管理</a></li>
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